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WAEC Mathematics 1988 Question 6

Question 6

Measures of Central Tendency

A group of students took a test and the following frequency table shows the scores:
Score: 0, 1, 2, 3, 4, 5
Frequency: 2, 3, 4, 2, 7, 2
Find the mean score

  1. A.1.75
  2. B.2
  3. C.2.5
  4. D.2.75
  5. E.3
Show the answer and explanation

Answer: D (2.75)

Explanation

Σfx = 0 + 3 + 8 + 6 + 28 + 10 = 55 and Σf = 20, so the mean = 55 ÷ 20 = 2.75.